double-layer current

The non-faradaic current associated with the charging of the electrical double layer at an electrode-solution interface, given by:

$i DL = d ( σ A ) d t$

where $σ$ = surface charge density of the double layer, $A$ = area of the electrode-solution interface and $t$ = time. Capital letters should be used as subscripts to avoid the possibility of confusing this symbol with that for the limiting diffusion current.

Source:

PAC, 1985, 57, 1491 (Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)) on page 1496